Cooled Housings

Whether your interest is in a research system or production instrumentation, we can offer a wide range of associated hardware for your photomultiplier application:

The effect of cooling

At room temperature, the contribution from thermally generated electrons from the photocathode dominates. This figure shows the effect of temperature on dark counts and the advantage of cooling in low level detection is obvious. For all cathodes shown, there is little advantage in cooling below -25 °C.

Features include:

capable of cooling to 50 °C below the cooling medium temperature

included positive or negative HV voltage divider

space for additional circuitry

evacuated double walled Pyrex window for condensation free use

over temperature cut out with visual and audible warning

can be set to within 0.1 °C

The standard Pyrex window has a short wavelength cut-off at 280 nm. An optional quartz window is available for use in the UV; this extends detection down to 170 nm.